"I've studied this league," Wondolowski told reporters following last week's match. "I'm very proud to be a part of it, and so I know who's up there.

"It's crazy to think (about). That's a special part of it. It's a number but it's a number where some of the best that have played in this league have reached. I'm not there yet but I'm hoping to be there and be synonymous with those names. It's pretty unreal, to be honest."

Sunday's fixture is not just about Wondolowski, with the in-form Earthquakes - fourth in the Western Conference - looking to extend their unbeaten streak in five matches.

Orlando, meanwhile, is riding high after last week's 4-0 drubbing of reigning champions Los Angeles Galaxy, which helped the expansion club up to fifth in the table.

The only other match on Sunday is an all-East affair, with the third-placed New York Red Bulls hosting the Philadelphia Union at Red Bull Arena.

Free-falling Los Angeles could be without captain Robbie Keane for its home game against the Houston Dynamo on Friday due to a groin injury.

The Galaxy are seventh in the West and without a win in five matches.

The Chicago Fire travel to the Columbus Crew on Friday.

On Saturday, Eastern Conference leaders DC United do battle with the New England Revolution in a top-of-the-table clash.

Toronto FC will be without star striker Jozy Altidore for the visit from the Portland Timbers, Western conference pacesetters FC Dallas makes the trip to face the Montreal Impact, who notched their first win of the season last week, and the Vancouver Whitecaps are away to the lowly Colorado Rapids.

The Seattle Sounders and Sporting Kansas City will meet in Seattle, while Real Salt Lake versus New York City is the other fixture on Saturday.